Protective helmet



FIG. 1 is a front perspective view of a protective helmet showing my newdesign;

FIG. 2 is a rear perspective view of the protective helmet of FIG. 1;

FIG. 3 is a front elevational view of the protective helmet of FIG. 1;

FIG. 4 is a right side elevational view of the protective helmet of FIG.1; the left side elevation being a mirror image thereof;

FIG. 5 is a rear elevational view of the protective helmet of FIG. 1;

FIG. 6 is a top plan view of the protective helmet of FIG. 1;

FIG. 7 is a front perspective view of a second embodiment thereof;

FIG. 8 is a rear perspective view of the protective helmet of FIG. 7;

FIG. 9 is a front elevational view of the protective helmet of FIG. 7;

FIG. 10 is a right side elevational view of the protective helmet ofFIG. 7; the left side elevation being a mirror image thereof;

FIG. 11 l is a rear elevational view of the protective helmet of FIG. 7;

FIG. 12 is a top plan view of the protective helmet of FIG. 7;

FIG. 13 is a front perspective view of a third embodiment thereof;

FIG. 14 is a rear perspective view of the protective helmet of FIG. 13;

FIG. 15 is a front elevational view of the protective helmet of FIG. 13;

FIG. 16 is a right side elevational view of the protective helmet ofFIG. 13; the left side elevation being a mirror image thereof;

FIG. 17 is a rear elevational view of the protective helmet of FIG. 13;and,

FIG. 18 is a top plan view of the protective helmet of FIG. 13.

I claim the ornamental design for a protective helmet, as shown anddescribed.